Explanation:

Constitution authorises the Parliament to form new states or alter the areas, boundaries or names of the existing states without the consent of concerned state legislature or union territory. In other words, Parliament can redraw the political map of India according to its will. Hence, the territorial integrity or continued existence of any state is not guaranteed by the Constitution.
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Constitution (Article 4) itself declares that laws made for admission or establishment of new states (under Article 2) and formation of new states and alteration of areas, boundaries or names of existing states (under Articles 3) are not to be considered as amendments of the Constitution under Article 368. This means that such laws can be passed by a simple majority and by the ordinary legislative process.
The Constitution (under Article 15) prohibits discrimination against any citizen on grounds of religion, race, caste, sex or place of birth and not on the ground of residence. This means that the state can provide special benefits or give preference to its residents in matters that do not come within the purview of the rights given by the Constitution to the Indian citizens. For example, a state may offer concession in fees for education to its residents.